Sun. Sep 25th, 2022
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    SHA-1 Collision Attacks are Now Actually Practical and a Looming Danger

    An extract from an article by Catalin Cimpanu published by ZDNet

    Attacks on the SHA-1 hashing algorithm just got a lot more dangerous last week with the discovery of the first-ever “chosen-prefix collision attack,” a more practical version of the SHA-1 collision attack first carried out by Google two years ago.

    What this means is that SHA-1 collision attacks can now be carried out with custom inputs, and they’re not just accidental mishaps anymore, allowing attackers to target certain files to duplicate and forge.

    SHA-1 Collision Attacks

    The SHA-1 hashing function was theoretically broken in 2005; however, the first successful collision attack in the real world was carried out in 2017.

    Two years ago, academics from Google and CWI produced two files that had the same SHA-1 hash, in the world’s first ever SHA-1 collision attack — known as “SHAttered.”

    Cryptographers predicted SHA-1 would be broken in a real-world scenario, but the SHAttered research came three years earlier than they expected, and also cost only $110,000 to execute using cloud-rented computing power, far less than what people thought it might cost.

    Read the complete article at SHA-1 Collision Attacks are Now Actually Practical and a Looming Danger

     

    From Collisions to Chose-Prefix Collisions Application to Full SHA-1

    An extract and research report by Gaetan Leurant and Thomas Peyrin

    This work puts another nail in the SHA-1 coffin, with almost practical chosen-prefix collisions, between five and twenty-six times more expensive than the identical-prefix collisions recently demonstrated. This shows that continued usage of SHA-1 for certificates or for authentication of handshake messages in TLS, SSH or IKE is dangerous, and could already be abused today by a well-motivated adversary. SHA-1 has been broken since 2004, but it is still used in many security systems; we strongly advise users to remove SHA-1 support to avoid downgrade attacks.

    More generally, our results show that, for some hash functions, chosen-prefix collision attacks are much easier than previously expected, and potentially not much harder than a normal collision search.

    The Complete Report

    From Collisions to Chose-Prefix Collisions Application to Full SHA-1

    Read the complete PDF

     

    Additional Reading

    Source: ComplexDiscovery

     

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